randomColor generates attractive colors by default. More specifically, randomColor produces bright colors with a reasonably high saturation. This makes randomColor particularly useful for data visualizations and generative art.
xcolor jQuery plugin implements an extensive color parser and a featureful set of color-manipulation methods. There is also an
animate() extension to smooth CSS colors. The color value can also be passed in different color models: RGB, HSV/HSB, HSL and their adequate alpha extensions.
Jumble is a jQuery plugin that jumbles up the colours of your text - and can animate them. (which is mobile safe)